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Regulatory Capital (Tables)
 12 Months Ended
Dec. 31, 2017
Brokers and Dealers [Abstract]  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations
The Company's capital amounts and ratios, as calculated under regulatory guidelines of Basel III at December 31, 2017 and 2016 are presented in the following table:
(dollars in thousands)
Actual
 
For Capital Adequacy Purposes
 
To be Well Capitalized
 
Amount
 
Ratio
 
Amount
 
Ratio
 
Amount
 
Ratio
As of December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
Total Capital
 
 
 
 
 
 
 
 
 
 
 
(to Risk Weighted Assets)
 
 
 
 
 
 
 
 
 
 
 
Consolidated
$
2,844,261

 
14.06
%
 
$
1,618,009

 
8.00
%
 
$
2,022,511

 
10.00
%
Umpqua Bank
$
2,668,069

 
13.21
%
 
$
1,615,698

 
8.00
%
 
$
2,019,623

 
10.00
%
Tier 1 Capital
 
 
 
 
 
 
 
 
 
 
 
(to Risk Weighted Assets)
 
 
 
 
 
 
 
 
 
 
 
Consolidated
$
2,238,540

 
11.07
%
 
$
1,213,507

 
6.00
%
 
$
1,618,009

 
8.00
%
Umpqua Bank
$
2,523,599

 
12.50
%
 
$
1,211,774

 
6.00
%
 
$
1,615,698

 
8.00
%
Tier 1 Common
 
 
 
 
 
 
 
 
 
 
 
(to Risk Weighted Assets)
 
 
 
 
 
 
 
 
 
 
 
Consolidated
$
2,238,540

 
11.07
%
 
$
910,130

 
4.50
%
 
$
1,314,632

 
6.50
%
Umpqua Bank
$
2,523,599

 
12.50
%
 
$
908,830

 
4.50
%
 
$
1,312,755

 
6.50
%
Tier 1 Capital
 
 
 
 
 
 
 
 
 
 
 
(to Average Assets)
 
 
 
 
 
 
 
 
 
 
 
Consolidated
$
2,238,540

 
9.38
%
 
$
954,403

 
4.00
%
 
$
1,193,003

 
5.00
%
Umpqua Bank
$
2,523,599

 
10.59
%
 
$
953,264

 
4.00
%
 
$
1,191,579

 
5.00
%
As of December 31, 2016
 
 
 
 
 
 
 
 
 
 
 
Total Capital
 
 
 
 
 
 
 
 
 
 
 
(to Risk Weighted Assets)
 
 
 
 
 
 
 
 
 
 
 
Consolidated
$
2,707,693

 
14.72
%
 
$
1,471,577

 
8.00
%
 
$
1,839,471

 
10.00
%
Umpqua Bank
$
2,534,927

 
13.79
%
 
$
1,470,731

 
8.00
%
 
$
1,838,414

 
10.00
%
Tier 1 Capital
 
 
 
 
 
 
 
 
 
 
 
(to Risk Weighted Assets)
 
 
 
 
 
 
 
 
 
 
 
Consolidated
$
2,108,948

 
11.47
%
 
$
1,103,682

 
6.00
%
 
$
1,471,577

 
8.00
%
Umpqua Bank
$
2,397,449

 
13.04
%
 
$
1,103,048

 
6.00
%
 
$
1,470,731

 
8.00
%
Tier 1 Common
 
 
 
 
 
 
 
 
 
 
 
(to Risk Weighted Assets)
 
 
 
 
 
 
 
 
 
 
 
Consolidated
$
2,108,948

 
11.47
%
 
$
827,762

 
4.50
%
 
$
1,195,656

 
6.50
%
Umpqua Bank
$
2,397,449

 
13.04
%
 
$
827,286

 
4.50
%
 
$
1,194,969

 
6.50
%
Tier 1 Capital
 
 
 
 
 
 
 
 
 
 
 
(to Average Assets)
 
 
 
 
 
 
 
 
 
 
 
Consolidated
$
2,108,948

 
9.21
%
 
$
915,917

 
4.00
%
 
$
1,144,896

 
5.00
%
Umpqua Bank
$
2,397,449

 
10.47
%
 
$
916,260

 
4.00
%
 
$
1,145,325

 
5.00
%